OK.
I usually record to a stereo track, and then use a gain plugin on the channel when reamping, which has a balance control; I turn the balance control to the "dry" side (i.e. the DI track), and switch it to mono. That way I get a normal mono signal of the DI track which I send to the Kemper. The thing is I have to compensate around 6 dB due to the pan law.
Come to think of it, maybe this is not the reason anyway - that should be +4.5 dB instead for my DAW, I think.
Hmmm...